A Los Angeles-based bartender, Rob Diaz also spends his time attending a real estate course in the city. He tends to think outside of the box and is characterized by his spontaneous and compassionate personality.

Kimberly Chabolla is employed at a public relations agency in Los Angeles, California. Her interests include snowboarding, wakeboarding and working out. She is quite competitive, but admits to being overly neat and clumsy at times.

After meeting at a bar and then dating for two years, Rob and Kimberly made the big decision to move in together. They tried out for the tenth season of The Amazing Race because they wanted to test the strength of their relationship. At the beginning of the competition, Rob and Kimberly were in the middle of the pack, but after arriving first at the end of the fourth leg (where they each won a jet ski), they maintained a third place finish at every succeeding pit stop, with the exception of the final pit stop, where they came in second at the final leg back in the United States.

They lost the AMAZING RACE 10 title and the one million dollar prize to Tyler and James due to their taxi driver that don't have E-Z Pass; after the two male models speed ahead of them in a taxi whose driver had an E-Z Pass toll.